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We have measured the rate of elongation of a loaded Kevlar-49 fiber as a function of time at 4.2K. The result puts a worst case upper limit of 0.028% in the elongation rate ΔL/L for a 0.5mm diameter fiber kept under a constant tension of 2.7kg for 8months. A value that is probably closer to reality is actually 0.004%. This result proves that Kevlar-49 can be safely used in cryogenic applications in...
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